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0 <br /> i <br /> J <br /> ` August 5, 1991 _--_-- 15es ► " <br /> ARCO Station No. 6100, Tracy, California a AAWA WA U VA <br /> According to a report by Roux Associates of Martinez, California, gasoline hydrocarbons <br /> were present at the base of the new tank cavity and along the east, west, and southeast <br /> corners of the new tank cavity(Roux Associates,May 29, 1991, Report No.AR06776W.1..1). <br /> Gasoline hydrocarbons - 'ere also detected in samples collected be0eath the pipelines east <br /> of the two dispenser islands and below the two dispenser islands. On the basis of the results <br /> of the previous work performed at the site, remediation of the soii beneath the site ''s <br /> warranted. Remediation of soil using vapor extrz!etion may be feasible;nowever,the lateral <br /> and vertical extent of residual hydrocarbons in soil is needed to evaluate locations for vapor- <br /> extraction wells. In addition,a vapor-extraction test is necessary to evaluate the location of <br /> wells for a complete vapor-extraction remediation system. Therefore, we propose that <br /> additional borings be drilled at locations shown on Plate 2 to collect soil samples for <br /> laboratory analyses to evaluate the extent of residual hydrocarbons in soil beneath the site <br /> and eight vapor-extraction wells be installed to perform a vapor-extraction test. <br /> Additionally, we propose borings to be drilled at locations shown on Plate 2 if further <br /> evaluation of the lateral extent of residual hydrocarbons in soil is needed. <br /> Work Plan <br /> r <br /> At ARCO's request, Applied GeoSystems will perform the following; <br /> o Update the site safety plan. <br /> o Provide liaison with the SJCPHS and acquire the appropriate permits. <br /> o Provide liaison wish the San Joaquin County Department of Public Works to <br /> obtain appropriate permits to drill one boring in the sidewalk along Patterson <br /> Pass Road. <br /> o Contact Underground Service Alert at least 48 hours before drilling to identify <br /> public utility lines at the site. <br /> e Provide a contractor to cut concrete to provide an access for drilling a boring <br /> through the concrete pad of the dispenser island to install a vapor-extraction <br /> well. <br /> 0619cear <br /> - 041-2w 2 <br /> i <br />